Pneumatic tire



-A Patented Nov. 20, 1923.

which is' sometimes rough and has a UNITED stares GERHARD e.scHoNEisERGn PATE NToF-FICE.

n, or our PARK, ILLINoIs.

PN EUMATIC TIRE. r l

Application filed December 1, 1922. Serial No. 604,381.A

new and Vuseful Improvements in Pneumatic N Tires, of which thefollowing isa specification.

My invention relates to pneumatic tires,

'the object being to provide improved construction which will make thetire proof against punctures and blowoutsand which will greatly increasethe` life of the outer casing.

, In accordance with my casing for increasing thecushioning propertiesof the tire as a whole, and also a protecting layer for preventingpuncturing of the inner tube and for preventing blowouts'.

On the accompanying drawing the various features of my invention areillustrated and on the drawing the figure is a cross sectional View of atire.

The tire casing l shown is of the ordinary construction, and 2represents the ordinary, inner tube with its air nipple 3'.' In theordinary arrangement the inner tube lies directly against the inner wallof the casindg ten ency to chafe the inner tube during travel of thevehicle. Also, with this arrangement, when a particle penetrates thecasing inner tube is immediately punctured and if the casing is cut theinner tube will yield at that point and a blowout will result. Toovercome these disadvantages I interpose what may' be termed anintermediate tube x structure designated as a whole by' z'. Theintermediate tube shown comprises a crescent shaped outer layerLipreferably of soft or sponge rubber, or rubber composition. Inside ofthis outer layer is the intermediate crescent shaped layer 5 of harderandv tougher material such Las hard rubber ,or fabric, or a combinationof rubber and fabric'., The .inner layer 6 is of soft yieldablerubberand may be made ofthe same grade of rubber as that used forotherwise secured intimately together and f the 110 tube for insertionbeing provided at its inner side with the longitudinally extendingopening? through in the outer casing 1 with its thicker part `along thetread and with its thinner part along the' sides of. the casing. WhentheI inner tube 2 is then inserted and inflated in the ordinary will befirmly `pressed against the inner side of the casing,- and in order toincrease the frictionakengagement and prevent displacemerit of the innertube I preferably provide vacuum depressions or pockets 8 in tthe outerface of intermediate layer 5Y is almost certain to prevent furthertravel so thatthe inner tube will be prevented from being punctuxed..

. Another advanta e of the improved arrangement is `that lowouts areless likely occur forv the reason that if the outer casing should begashed or mediate tube will be between the gash and into the casing, thetube f manner the intermediate tube inner tube will be in danger of cutthe inter- (the intermediate tube will prevent-the inner tubefrom beingblown out.

Another advantage ,of the improved construction is that greaterresilienc will be 'given to the tirestructure as' a wllole ticularlywhen traveling'4 over "objects ike small stones, the abrupt shocks onthe outer casing being communicated to and to a great extent absorbed bythe cushionin material of the outer layer 4 of the interme iate tube.

Having described -my invention,

as follows: f f

A protective insert for pneumatic tires comprising an lnner tubularlayerof pliable o its inner opemn for t lnsertio side to Iprovide aninner tu said layer bef of an inflatable I i claim lintermediate layerof ing of uniform thickness throughout7 an hard puncture resistingrubber extending side portions and to within a short distance of theinner ends of said inner layer, and

'an outer layer of soft cushioning rubber extending along the tread andside portions n to within a short distance of the inner ends of saidinner layer, said intermediate and along the tread and.

outer .layers being l of

